| Individual aircraft fatigue monitoring is the product when aircraft fatigue life monitoring ideology develops from “aircraft cluster life management” to “individual aircraft life management”. Individual aircraft fatigue life is closely related to. From this, we can say that aircraft fatigue life is decided by the life of key parts of aircraft structure. It will affect flight safety and even cause the flight accident. However, the modern aircraft manufacturing cost is getting more and more expensive, prompts people to research and develop the accurate prediction of aircraft fatigue life, improve economic benefits continually.This thesis reviews the development of aircraft life monitoring ideology, and then proposes a calculation and analysis method of physical prototype based life based on the question of fatigue life monitoring in technology. In addition, a complete set of analysis process is given. Finally, the analysis is focus on the research of load inversion problem. This thesis proposes the method of complex stress function for inversion problem of external load, according to the analysis of structure physical prototype, This method establishes the analysis relationship between detection value of stress and strain and the external load applied in the structure, and finally through the numerical method to solve the external load(size, direction)which meets the analytical relation. Based on this method,this thesis analyzes the method of building physical model structure of two kinds of force characteristic and its accuracy, as well as the position of detection point. In the end, load inversion and fatigue life estimation are completed using the method of former chapter for the perforated plate in unknown loads. The results show that the method proposed in this thesis is feasible and effective. |
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